I wouldn't put anything in her lifebook about why she was placed unless you are 110% certain.
In this day and age - more and more international adoptions are fully open and more and more adoptees adopted abroad are seeking out their first families once they are adults. It would be better to leave it unsaid and/or suggest the 'typical reasons' why this takes place in Kaz than to have your daughter grow up with one idea and have her world rocked by the truth.
Try to stick to the facts and you'll be just fine!
